linux-kernel - Re: [RFC PATCH v1 2/2] powerpc/86xx: Introduce and use common dtsi

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Date:	Tue, 1 Mar 2016 15:55:31 +0100
From:	Alessio Igor Bogani <alessio.bogani@...ttra.eu>
To:	Scott Wood <oss@...error.net>
Cc:	Kumar Gala <galak@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v1 2/2] powerpc/86xx: Introduce and use common dtsi

Scott,

On 29 February 2016 at 23:38, Scott Wood <oss@...error.net> wrote:
[...]
> Could you post a diff of what the decompiled trees look like before and after
> this change (e.g. interrupts went from 2-cell to 4-cell)?  It is very hard to
> review in this form.  Or better, like the config change, have a commit that
> first makes changes to what the unified trees will be, and then a second
> commit that generates the same output using includes.

Yes I'll surely do it.

>> +/include/ "qoriq-mpic.dtsi"
>> +     pic@...00 {
>> +             compatible = "chrp,open-pic";
>> +     };
>
> This is removing the fsl,mpic compatible, which is required for 4-cell
> interrupt specifiers.

Ok.

>> +&pci0 {
>> +     compatible = "fsl,mpc8641-pcie";
>> +     device_type = "pci";
>> +     #size-cells = <2>;
>> +     #address-cells = <3>;
>> +     bus-range = <0x0 0xff>;
>> +     clock-frequency = <33333333>;
>
> The clock frequency of PCI Express is not 33 MHz.

A lot of dtsi files into fsl directory have got that value!

>> diff --git a/arch/powerpc/boot/dts/fsl/mpc8641si-pre.dtsi
[...]
>> +/dts-v1/;
>> +
>> +/ {
>> +     compatible = "fsl,MPC8641";
>
> This compatible is pointless -- it will be overwritten by the board
> compatible.

Ok.

Thanks for have reviewed my patches.

Ciao,
Alessio